Summary

Summary

• Caching improves Web application performance by storing responses to frequent requests in memory rather than processing each request separately.

• Cached responses should not contain data that changes frequently, because the response is frozen in memory for the duration of the cache.

• Use the VaryByParam attribute to cache multiple responses for a Web form based on different control selections.

• To cache part of a Web form, create that portion of the Web form as a user control and add an OutputCache directive to that control.

• Before using a cached user control in code, test to make sure it exists. Cached controls are available in code only when they are instantiated or when they are reloaded into the cache.

• Cache application data using the Cache object.

• Use the onRemoveCallback delegate to detect when cached data is about to be unloaded from memory.

• Set a dependency to cause cached data to expire when an external data source has changed.

• Monitor an application s use of the cache through the MMC Performance Logs and Alerts snap-in.